print("i \"like\" you")


str1 = "Hello world"
str2 = "I am Victor"
str3 = "How are you"
str4 = "i am Fine Thank you"

str5 = str1.lower()
print("str5(lower): " + str5)

str6 = str2.upper()
print("str6(upper): " + str6)

str7 = str3.title()
print("str7(title): " + str7)

print("str4 = " + str4)
print("length of str4 is " + str(len(str4))) # transform int to str
str77 = str(int("4") + int("6"))
print('str(int("4") + int("6")) = ' + str77) # transform str to int
str71 = str(float("3.14") + int("3"))
print('str(float("3.14") + int("3")) = '+ str71)
# int() 去掉小数点后面的内容

# 去掉字符串空白
str8 = "    i love China!  "
# 去左边空白
print("str8 lstrip=" + str8.lstrip())
# 去右边空白
print("str8 rstrip=" + str8.rstrip())
# 去两头空白
print("str8 strip=" + str8.strip())

num1 = 3*4
print("3*4="+str(num1))
num2 = 3**2
print("3**2="+str(num2))
num3 = 6 / 4
print("6 / 4="+str(num3)) # 1.5
num4 = 6 // 4
print("6 // 4="+str(num4)) # 1 去掉了小数部分


# python3
# import this

# The Zen of Python, by Tim Peters

# Beautiful is better than ugly.
# Explicit is better than implicit.
# Simple is better than complex.
# Complex is better than complicated.
# Flat is better than nested.
# Sparse is better than dense.
# Readability counts.
# Special cases aren't special enough to break the rules.
# Although practicality beats purity.
# Errors should never pass silently.
# Unless explicitly silenced.
# In the face of ambiguity, refuse the temptation to guess.
# There should be one-- and preferably only one --obvious way to do it.
# Although that way may not be obvious at first unless you're Dutch.
# Now is better than never.
# Although never is often better than *right* now.
# If the implementation is hard to explain, it's a bad idea.
# If the implementation is easy to explain, it may be a good idea.
# Namespaces are one honking great idea -- let's do more of those!


# 《Python的禅》，蒂姆·彼得斯著
# 美丽胜于丑陋。
# 显式比隐式好。
# 简单总比复杂好。
# 复杂总比隐晦好
# 平的比嵌套的好。
# 稀胜于密。
# 可读性很重要。
# 特殊情况不足以打破规则。
# 尽管实用胜过纯粹。
# 错误永远不应该悄无声息地过去。
# 除非明确沉默。
# 面对歧义，拒绝猜测的诱惑。
# 应该有一种——最好只有一种——显而易见的方法来做到这一点。
# 尽管这种方式一开始可能并不明显，除非你是荷兰人。
# 现在总比没有好。
# 尽管从来没有比现在更好的了。
# 如果实现很难解释，那就是个坏主意。
# 如果实现很容易解释，那可能是个好主意。
# 名称空间是一个非常棒的想法——让我们做更多这样的事情吧！





